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What ratio to expect
Although, in some situations, the deduplication ratio may be very high (in the previous example,
increasing the number of machines would lead to ratios of 3:1, 4:1, etc.), a reasonable expectation for
a typical environment is a ratio between 1.2:1 and 1.6:1.
As a more realistic example, suppose that you are performing a file-level or disk-level backup of two
machines with similar disks. On each machine, the files common to all the machines occupy 50% of
disk space (say, 1 GB); the files that are specific to each machine occupy the other 50% (another
1 GB).
In a deduplicating vault, the size of the first machine's backup in this case will be 2 GB, and that of the
second machine will be 1 GB. In a non-deduplicating vault, the backups would occupy 4 GB in total. As
a result, the deduplication ratio is 4:3, or about 1.33:1.
Similarly, in case of three machines, the ratio becomes 1.5:1; for four machines, it is 1.6:1. It
approaches 2:1 as more such machines are backed up to the same vault. This means that you can
buy, say, a 10-TB storage device instead of a 20-TB one.
The actual amount of capacity reduction is influenced by numerous factors such as the type of data
that is being backed up, the frequency of the backup, and the backups' retention period.Similarly, in
case of three machines, the ratio becomes 1.5:1; for four machines, it is 1.6:1. It approaches 2:1 as
more such machines are backed up to the same vault. This means that you can buy, say, a 10-TB
storage device instead of a 20-TB one.
The actual amount of capacity reduction is influenced by numerous factors such as the type of data
that is being backed up, the frequency of the backup, and the backups' retention period.
2.11.6.6. Deduplication restrictions
Block-level deduplication restrictions
During a disk backup to an archive in a deduplicating vault, deduplication of a volume's disk blocks is
not performed in the following cases:
• If the volume is a compressed volume
• If the volume's allocation unit size—also known as cluster size or block size—is not divisible by
4 KB
Tip: The allocation unit size on most NTFS and ext3 volumes is 4 KB and so allows for block-level
deduplication. Other examples of allocation unit sizes allowing for block-level deduplication include 8 KB,
16 KB, and 64 KB.
• If you protected the archive with a password
Tip: If you want to protect the data in the archive while still allowing it to be deduplicated, leave the archive
non-password-protected and encrypt the deduplicating vault itself with a password, which you can do when
creating the vault.
Disk blocks that were not deduplicated are stored in the archive as they would be in a non-
deduplicating vault.
- Advanced Workstation 1
- Table of Contents 3
- 1.2. Getting started 8
- Navigation tree 11
- Shortcuts bar 12
- Actions 13
- How to expand/minimize panes 14
- Action pages 15
- 1.3.1. Agent for Windows 17
- 1.3.1.1. Universal Restore 18
- 1.3.1.2. Deduplication 18
- 1.3.3.1. Management Server 19
- VMware vCenter integration 20
- 1.3.3.2. Storage Node 20
- 1.3.4. Management Console 21
- Acronis License Server 22
- 10 Storage Node 22
- 1.5. Supported file systems 23
- 1.6. Hardware requirements 23
- 1.7. Technical support 24
- 2.1. Basic concepts 25
- Backup using bootable media 27
- Full backup 29
- Incremental backup 30
- Differential backup 30
- 2.4. Owners and credentials 31
- Archive owner 32
- 2.5. GFS backup scheme 33
- The resulting archive: ideal 35
- The resulting archive: real 36
- Tower of Hanoi overview 37
- Tower of Hanoi by Acronis 38
- 2.7. Retention rules 39
- Combination of rules 1 and 2 40
- Best practices 41
- Backing up dynamic volumes 42
- Recovering dynamic volumes 42
- 2.9. Tape support 44
- 2.10.1. Acronis Secure Zone 46
- Limitation 47
- Restore) 48
- Limitations 49
- Getting Universal Restore 49
- Supported operating systems 49
- How it works 50
- Usage scenarios 50
- How to use 50
- 2.11.1. Basic concepts 51
- Setting up the storage node 54
- Policy on a machine 57
- Policy on a group 57
- Backup policy state diagram 62
- 2.11.6. Deduplication 64
- Deduplication database 65
- Deduplication at source 65
- Deduplication at target 66
- What ratio to expect 68
- Local connection 69
- Remote connection 69
- On a domain controller 71
- Remote Agent ports 75
- Client Encryption options 76
- Server Encryption options 77
- 2.11.8.5. SSL certificates 78
- Self-signed certificates 79
- Non-self-signed certificates 80
- 3. Options 81
- 3.1.3. Time-based alerts 82
- 3.1.4. Number of tasks 82
- 3.1.5. Fonts 83
- 3.2.1. Logging level 83
- 3.2.2. Log cleanup rules 83
- 3.2.3. Event tracing 84
- 3.2.5. Acronis WOL Proxy 85
- 3.3. Machine options 87
- 3.3.2. Event tracing 88
- 3.3.3. Log cleanup rules 90
- 3.4.1.1. Archive protection 93
- 3.4.1.3. Pre/Post commands 94
- Pre-backup command 95
- Post-backup command 96
- Pre-data capture command 97
- Post-data capture command 97
- • Always create a snapshot 98
- • Do not create a snapshot 98
- Volume shadow copy writers 99
- 3.4.1.8. Compression level 100
- 3.4.1.9. Backup performance 100
- Backup priority 100
- HDD writing speed 101
- Network connection speed 101
- 3.4.1.10. Notifications 102
- Windows event log 103
- Messenger service (WinPopup) 103
- 3.4.1.11. Event tracing 103
- SNMP notifications 104
- 3.4.1.13. Backup splitting 105
- 3.4.1.15. Media components 106
- 3.4.1.16. Error handling 107
- 3.4.1.17. Dual destination 108
- Skip the task execution 109
- 3.4.1.20. Tape support 110
- Always use a free tape 111
- Reset archive bit 112
- Use FTP in Active mode 113
- 3.4.2.1. Pre/Post commands 115
- Pre-recovery command 116
- Post-recovery command 116
- 3.4.2.2. Recovery priority 117
- 3.4.2.4. Notifications 117
- 3.4.2.5. Event tracing 119
- 3.4.2.6. Error handling 120
- 4. Vaults 123
- 4.1. Centralized vaults 124
- Vault toolbar 125
- Pie chart with legend 125
- Vault content 126
- Vault path 128
- Vault database path 129
- Vault encryption 129
- 4.1.3. Tape libraries 131
- 4.1.3.1. Overview 132
- 4.1.3.2. Hardware 132
- 4.1.3.3. Limitations 133
- 4.1.3.4. RSM Media Pools 133
- Prerequisites 134
- Backing up to tape library 136
- Recovering from tape library 136
- Inventory 137
- Labeling 138
- 4.1.3.7. Tape support 139
- 4.1.3.8. Tape rotation 140
- Choosing a backup scheme 140
- Criteria of the choice 141
- Case to analyze 141
- GFS Example 1 143
- GFS Example 2 146
- GFS Example 3 147
- ToH Example 1 149
- ToH Example 2 150
- ToH Example 3 151
- Tape planning 152
- Tape planning: Example 1 153
- Tape planning: Example 2 153
- 4.1.3.9. What if 154
- 4.2. Personal vaults 155
- 4.3. Common operations 158
- To show or hide columns 161
- 5. Scheduling 162
- 5.1. Daily schedule 163
- 5.2. Weekly schedule 165
- Examples 166
- 5.3. Monthly schedule 167
- Use Wake-On-LAN 170
- Parameters 171
- 5.6. Conditions 173
- 5.6.1. User is idle 174
- 5.6.3. Fits time interval 175
- 5.6.4. User logged off 176
- 6. Direct management 178
- Activities 179
- System view 180
- Way of working 180
- Backup plan execution states 181
- Backup plan statuses 182
- Task states 182
- Task statuses 183
- • Backup plan (p. 194) 184
- • Recovery task (p. 214) 184
- • Validation task (p. 233) 184
- Run backup plan 188
- Task details 188
- Archive 189
- Backup plan details 190
- 6.1.3. Log 191
- • Click View Details 192
- 6.1.3.3. Log entry details 193
- 6.2. Creating a backup plan 194
- How to back up 195
- Archive validation 195
- Backup options 195
- Convert to VM 195
- To specify credentials 196
- 6.2.3. Source type 197
- 6.2.4. Items to back up 197
- 6.2.6. Exclusions 199
- 6.2.7. Archive 200
- 6.2.9. Backup schemes 202
- 6.2.9.3. Simple scheme 203
- At a glance 206
- Example 207
- Roll-back period 208
- Resulting tasks 211
- 6.2.10. Archive validation 212
- 6.3. Recovering data 214
- What to recover 215
- Where to recover 215
- When to recover 215
- 6.3.1. Task credentials 216
- 6.3.2. Archive selection 217
- 6.3.3. Data type 217
- 6.3.4. Content selection 218
- 6.3.6.1. Disks 219
- Disk destination 220
- NT signature 220
- 6.3.6.2. Volumes 221
- MBR destination 222
- Volume destination 222
- Volume properties 222
- Properties 223
- Storage 224
- Processors 224
- 6.3.6.5. File destination 225
- Exclusions 225
- Overwriting 226
- 6.3.8. When to recover 227
- 6.3.9. Universal Restore 227
- Windows NT/2000/XP/2003 232
- Windows Vista/2008 233
- 6.4.1. Task credentials 234
- 6.4.2. Archive selection 235
- 6.4.3. Backup selection 236
- 6.4.4. Location selection 236
- 6.5. Mounting an image 237
- 6.5.1. Archive selection 238
- 6.5.2. Backup selection 239
- 6.5.3. Access credentials 239
- 6.6. Managing mounted images 240
- General 242
- 6.7.1. Task credentials 243
- 6.7.2. Archive selection 244
- 6.7.3. Backup selection 245
- 6.7.5. Location selection 245
- 2. Using the archives table 246
- 3. Naming the new archive 246
- 6.8. Acronis Secure Zone 247
- Settings 248
- 6.10. Bootable media 251
- Linux-based bootable media 252
- PE-based bootable media 252
- Using Bart PE 254
- Kernel parameters 255
- Network settings 256
- Network port 257
- 2.0 is 512MB 259
- To add an iSCSI device 262
- To add an NDAS device 262
- Linux commands and utilities 263
- Mounting backup volumes 267
- 6.10.6. Acronis PXE Server 268
- 6.11. Disk management 270
- Starting the operations 271
- 6.11.5. Disk operations 272
- Using advanced options 274
- System disk conversion 276
- 6.11.6. Volume operations 278
- Types of dynamic volumes 279
- Create volume wizard 280
- Select destination disks 280
- Set the volume size 281
- Set the volume options 281
- 6.11.6.2. Delete volume 282
- 6.11.6.3. Set active volume 283
- 6.11.6.6. Format volume 284
- 6.11.7. Pending operations 285
- 7. Centralized management 286
- 7.1.2. Backup policies 288
- Machines selection 291
- 7.1.2.4. Policy details 292
- 7.1.3. Physical machines 293
- Applying policies 295
- Grouping actions 295
- Other actions 296
- To add a machine 297
- • installing the agent 297
- Text file requirements 298
- Adding machines to a group 300
- Machine details 300
- Plans and tasks 302
- Member of 304
- Inheritance order 305
- 7.1.3.2. Actions on groups 306
- Adding multiple criteria 307
- Move one group to another 309
- Editing custom groups 309
- Group details 309
- 7.1.4. Virtual machines 311
- Grouping of virtual machines 312
- • Host/VA 313
- 7.1.5. Storage nodes 315
- Adding a storage node 317
- 7.1.6. Tasks 318
- 7.1.7. Log 320
- Local event log 321
- Centralized event log 321
- Configuring the log table 323
- 7.1.8. Reporting 324
- Generating reports 325
- Filters 325
- Report view 325
- Report coverage 328
- 7.1.8.8. Column selection 329
- 7.1.8.9. Report view 329
- Connection parameters 342
- Event tracing parameters 344
- When to modify 346
- What to back up 347
- Where to back up 347
- 7.3.1. Policy credentials 349
- 7.3.2. Items to back up 349
- Windows 352
- 7.3.4. Exclusions 354
- 7.3.5. Archive 355
- 7.3.7.1. Back up now scheme 357
- 7.3.7.3. Simple scheme 358
- 7.3.8. Archive validation 367
- Glossary 368
- Backup plan (Plan) 370
- Backup policy (Policy) 370
- Backup scheme 371
- Bootable agent 371
- Bootable media 371
- Built-in group 371
- Centralized backup plan 372
- Centralized management 372
- Centralized task 372
- Centralized vault 372
- Cleanup 373
- Consolidation 373
- Deduplicating vault 373
- Deduplication 373
- Direct management 374
- Disk backup (Image) 374
- Disk group 374
- Dynamic disk 375
- Dynamic group 375
- Dynamic volume 376
- Encrypted archive 376
- Encrypted vault 376
- Managed vault 378
- Media builder 378
- Personal vault 378
- Physical machine 378
- Storage node-side cleanup 380
- Storage node-side validation 380
- Tower of Hanoi 380
- Unmanaged vault 381
- Validation 381
- Validation rules 381
- Virtual machine 382
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