diff --git a/unit-files/backup-u@.service b/unit-files/backup-u@.service
index 8138ca75977abafb72f65f9c69432e6c7f1c4135..15ae63bc23dd72e42f50ef669fa387521b0cefed 100644
--- a/unit-files/backup-u@.service
+++ b/unit-files/backup-u@.service
@@ -20,6 +20,7 @@ ExecStart=/bin/bash -euxc ' \
     --rm \
     --name backup-%i \
     -h backup.container \
+    --cpu-shares=100 \
     -v /root:/root \
     -v /data/domains/%i:/backup indiepaas/duplicity \
       --full-if-older-than 1W \
diff --git a/unit-files/backup@.service b/unit-files/backup@.service
index e238ec28766eaf41f92b5fa49e4e469de64312b7..678fbce6077d31f8a23c9f8f070f1c994a7481d5 100644
--- a/unit-files/backup@.service
+++ b/unit-files/backup@.service
@@ -33,11 +33,11 @@ ExecStartPre=/bin/bash -euxc '\
           -p$mysql_passwd \
           -h db > /data/domains/%i/mysql/dump.sql; \
   fi'
-
 ExecStart=/bin/bash -euxc ' \
   /bin/docker run \
     --rm \
     --name backup-%i \
+    --cpu-shares=100 \
     -h backup.container \
     -v /root:/root \
     -v /data/domains/%i:/backup indiepaas/duplicity \