diff --git a/api/backup_endpoints.go b/api/backup_endpoints.go
index c3d2df1..a57b16a 100644
--- a/api/backup_endpoints.go
+++ b/api/backup_endpoints.go
@@ -2,14 +2,13 @@ package api
 
 import (
 	"fmt"
+	"github.com/patrickmn/go-cache"
 	"strconv"
-	"sync"
+	"time"
 )
 
-var (
-	backupUploadIDsMx sync.Mutex
-	backupUploadIDs   = map[string]string{}
-)
+// backupUploadIDs stores a cache of active S3 backups.
+var backupUploadIDs *cache.Cache
 
 type BackupRemoteUploadResponse struct {
 	UploadID string   `json:"upload_id"`
@@ -34,9 +33,9 @@ func (r *Request) GetBackupRemoteUploadURLs(backup string, size int64) (*BackupR
 	}
 
 	// Store the backup upload id for later use, this is a janky way to be able to use it later with SendBackupStatus.
-	backupUploadIDsMx.Lock()
-	backupUploadIDs[backup] = res.UploadID
-	backupUploadIDsMx.Unlock()
+	// Yes, the timeout of 3 hours is intentional, if this value is removed before the backup completes,
+	// the backup will fail even if it uploaded properly.
+	backupUploadIDs.Set(backup, res.UploadID, time.Hour*3)
 
 	return &res, nil
 }
@@ -53,11 +52,9 @@ type BackupRequest struct {
 // available for a user to view and download.
 func (r *Request) SendBackupStatus(backup string, data BackupRequest) error {
 	// Set the UploadID on the data.
-	backupUploadIDsMx.Lock()
-	if v, ok := backupUploadIDs[backup]; ok {
-		data.UploadID = v
+	if v, ok := backupUploadIDs.Get(backup); ok {
+		data.UploadID = v.(string)
 	}
-	backupUploadIDsMx.Unlock()
 
 	resp, err := r.Post(fmt.Sprintf("/backups/%s", backup), data)
 	if err != nil {