Hi, I submitted a pull request (PR) today to duplicacy to add a prune option -keep-max that allows you to specify a tag and how many snapshot revisions to keep for that tag, etc. This has frequently been requested (or at least something different than the current -keep logic).
If this is accepted by gilbertchen, I’ll update the prune wiki page, but for now, here’s a snippet of how it will work:
Quick overview
NAME:
duplicacy prune - Prune revisions by number, tag, or retention policy
USAGE:
duplicacy prune [command options]
OPTIONS:
-id <snapshot id> delete revisions with the specified snapshot ID instead of the default one
-all, -a match against all snapshot IDs
-r <revision> [+] delete the specified revisions
-t <tag> [+] delete revisions with the specified tags
-keep <n:m> [+] keep 1 revision every n days for revisions older than m days
-keep-max <n> keep max n most recent revisions matching the tag -t
-exhaustive remove all unreferenced chunks (not just those referenced by deleted snapshots)
-exclusive assume exclusive access to the storage (disable two-step fossil collection)
-dry-run, -d show what would have been deleted
-delete-only delete fossils previously collected (if deletable) and don't collect fossils
-collect-only identify and collect fossils, but don't delete fossils previously collected
-ignore <id> [+] ignore revisions with the specified snapshot ID when deciding if fossils can be deleted
-storage <storage name> prune revisions from the specified storage
-threads <n> number of threads used to prune unreferenced chunks
Usage
duplicacy prune [command options]
Options
Options marked with [+] can be passed more than once.
-keep-max <n>
Keep max n most recent revisions for the specified tag -t.
A single tag -t must be specified when using -keep-max. The -keep-max and -keep options are mutually exclusive.
Examples:
duplicacy prune -keep-max 24 -t hourly # Keep 24 most recent revisions with tag hourly
duplicacy prune -keep-max 7 -t daily # Keep 7 most recent revisions with tag daily
duplicacy prune -keep-max 4 -t weekly # Keep 4 most recent revisions with tag weekly
duplicacy prune -keep-max 3 -t monthly # Keep 3 most recent revisions with tag monthly
duplicacy prune -keep-max 4 -t quarterly # Keep 4 most recent revisions with tag quarterly
duplicacy prune -keep-max 3 -t yearly # Keep 3 most recent revisions with tag yearly
The -keep-max option must specify a number >= 0. If n is 0, all revisions matching the tag will be pruned. If n is greater than 0, then n of the most recent snapshot revisions will be kept.