Small improvements

docker-compose.yml

@@ -18,10 +18,11 @@ services:
       - BORG_PASSPHRASE_1=$PASSWORD
       - BORG_REPO_1=/local-backup
 
-      - KEEP_DAILY=6 # the following are passed to `borg prune`
-      - KEEP_WEEKLY=3
-      - KEEP_MONTHLY=48
-      - KEEP_YEARLY=10
+      # the following are passed to `borg prune`
+      - KEEP_DAILY=6 # default: 6
+      - KEEP_WEEKLY=3 # default: 3
+      - KEEP_MONTHLY=48 # default: 48
+      - KEEP_YEARLY=10 # default: 0
     volumes:
       - /volumes:/source:ro # we will backup this folder, we mustn't change it, so it's readonly
       - /volumes/backup:/snapshot # we must mount a btrfs path for the snapshot to be put at, this is just a temporary path
@@ -29,7 +30,7 @@ services:
       - borg-cache:/root/.cache/borg # speed up subsequent backups
 
       - /bulk/backup:/local-backup # this is an example target backup path for BORG_REPO_1 from above
-      - /volumes/backup/id_rsa:/root/.ssh/id_rsa # this is an example for mounting an ssh key for a remote repo (BORG_REPO_0 above)
+      - /volumes/backup/config/id_rsa:/root/.ssh/id_rsa # this is an example for mounting an ssh key for a remote repo (BORG_REPO_0 above)
 
     cap_add:
       - SYS_ADMIN # we need this capability to snapshot a btrfs volume

src/backup-wrapper.sh

@@ -37,7 +37,8 @@ configure_environment() {
 }
 
 main() {
-    if [ -n "$BORG_PASSPHRASE" ] && [ -n "$BORG_REPO" ]; then
+    if [ -n "$BORG_REPO" ]; then
+        # fallback case if multi-target backup isn't needed
         execute_script
     else
         local index=0

src/backup.sh

@@ -18,7 +18,9 @@ if [ $? -ne 0 ]; then
     borg init --encryption=repokey
 fi
 
-# the above command will fail if the repo hasn't been already initialized, so we can ignore the return status
+# The above command will fail if the repo hasn't been already initialized, 
+# so we can ignore the return status. However, if any of the commands below fail,
+# we want to stop the script immediately.
 set -e
 
 if [ -d "/snapshot/source" ]; then
@@ -28,7 +30,12 @@ fi
 btrfs subvolume snapshot /source /snapshot
 
 cd /snapshot/source
-borg create --stats --list --filter=AMCE --files-cache=ctime,size --compression=zstd,12 --exclude-from /exclude.conf ::"{hostname}-{now:%Y-%m-%dT%H:%M:%S}" .
+borg create --stats \
+    --list \
+    --filter=AMCE \
+    --files-cache=ctime,size,inode \
+    --compression=zstd,12 \
+    --exclude-from /exclude.conf ::"{hostname}-{now:%Y-%m-%dT%H:%M:%S}" .
 cd -
 
 borg prune --list --stats \