fix(remote-backup.sh): old backups weren't deleted before. Configure to keep last 3 full backups only.

We keep last 3 full backups that means we have backups for last 3 months.

See also: https://lists.gnu.org/archive/html/duplicity-talk/2017-03/msg00017.html

Fix #1155

[skip ci]

Author: php-coder

vagrant/provisioning/roles/mystamps-backup/templates/remote-backup.sh

@@ -20,13 +20,13 @@ case "${1:-}" in
 		su mystamps 2>&1 \
 			-c "${DUPLICITY_CMD} --name=uploads --no-encryption /data/uploads ${UPLOADS_DST}"
 		su mystamps 2>&1 \
-			-c "duplicity remove-older-than 6M ${UPLOADS_DST}"
+			-c "duplicity remove-all-but-n-full 3 --force ${UPLOADS_DST}"
 		;;
 	'mysql-backups')
 		PASSPHRASE="$PASSPHRASE" su mystamps 2>&1 \
 			-c "${DUPLICITY_CMD} --name=mysql-backups /data/backups ${MYSQL_BACKUPS_DST}"
-		PASSPHRASE="$PASSPHRASE" su mystamps 2>&1 \
-			-c "duplicity remove-older-than 6M ${MYSQL_BACKUPS_DST}"
+		su mystamps 2>&1 \
+			-c "duplicity remove-all-but-n-full 3 --force ${MYSQL_BACKUPS_DST}"
 		;;
 	*)
 		echo 2>&1 "Usage: $(dirname "$0") (uploads|mysql-backups)"