modules/backup: Also make the cache for the admin storagebox presistent

Otherwise, we run out of cache, before it can do anything (due to the
limited size of available root tempfs).

1 files changed, 11 insertions, 0 deletions

diff --git a/modules/by-name/ba/backup/module.nix b/modules/by-name/ba/backup/module.nix
index 37e93849..0e2630f3 100644
--- a/modules/by-name/ba/backup/module.nix
+++ b/modules/by-name/ba/backup/module.nix
@@ -63,12 +63,23 @@ in {
     soispha.impermanence.directories = lib.mkMerge [
       (lib.mkIf cfg.storagebox.enable [
         "/var/cache/restic-backups-storagebox"
+
+        # Generate the base systemd.mount from impermanence (we will override this, so it
+        # points to the non-admin one instead)
+        "/var/cache/restic-backups-storagebox-admin"
       ])
       (lib.mkIf cfg.local.enable [
         "/var/cache/restic-backups-local"
       ])
     ];
 
+    # TODO: Make this work (`systemd.mounts` is a list, so _this_ doesn't work.) <2026-07-07>
+    # systemd.mounts."/var/cache/restic-backups-storagebox-admin" = {
+    #   # TODO: Don't hardcode the path, but use
+    #   # `systemd.mounts."/var/cache/restic-backups-storagebox".what` instead <2026-07-07>
+    #   what = "/srv/var/cache/restic-backups-storagebox";
+    # };
+
     age.secrets = {
       resticStorageboxSshKey = lib.mkIf cfg.storagebox.enable {
         file = cfg.storagebox.sshKey;