Storing Repository Sets
After initializing the VPG, Zerto Virtual Replication periodically checks that the schedule to run an retention process has not been passed, either a daily, weekly or monthly retention process. At the scheduled retention process time, the retention process is run and the retention set is stored in the specified repository.
Repository sets are kept on the recovery site for the retention period specified in the Retention Policy in the VPG. However, over time the number of stored retention sets is reduced to save space.
Note: |
Zerto’s calculation is based on the following logic: 1 month = 4 weeks (28 days). Therefore, 12 months = 343 days (and not 365). |
The number of stored retention sets for a daily retention process is as follows:
Retention period | Daily | Weekly | Monthly | Number of Retention Sets | Maximum Number of Days to Oldest Retention Set |
1 week | 7 | 0 | 0 | 7 | 7 |
1 month | 7 | 4 | 0 | 11 | 35 |
3 months | 7 | 4 | 2 | 13 | 91 |
6 months | 7 | 4 | 5 | 16 | 175 |
9 months | 7 | 4 | 8 | 19 | 259 |
12 months | 7 | 4 | 11 | 22 | 343 |
That is, a retention set is kept for each day for the current week and then the oldest retention set for the previous week is kept for the previous four weeks and then the oldest monthly retention set is kept for the rest of the retention period.
The number of stored retention set for a weekly retention process is as follows:
Retention period | Weekly | Monthly | Number of Retention Sets | Maximum Number of Days to Oldest Retention Set |
1 week | 1 | 0 | 1 | 7 |
1 month | 4 | 1 | 5 | 58 |
3 months | 4 | 3 | 7 | 121 |
6 months | 4 | 6 | 10 | 205 |
9 months | 4 | 9 | 13 | 289 |
12 months | 4 | 12 | 16 | 373 |
That is, a retention set is kept for each week for the current month and then the oldest retention set for the month is kept and then the oldest monthly retention set is kept for the rest of the retention period.