diff --git a/dap-sdk b/dap-sdk
index 26f3dec199f975c29b7b8c241c108065e18e16ee..04ef13ca16b33048a548e83bed29696e9cffc9d0 160000
--- a/dap-sdk
+++ b/dap-sdk
@@ -1 +1 @@
-Subproject commit 26f3dec199f975c29b7b8c241c108065e18e16ee
+Subproject commit 04ef13ca16b33048a548e83bed29696e9cffc9d0
diff --git a/modules/net/dap_chain_node_cli_cmd.c b/modules/net/dap_chain_node_cli_cmd.c
index 23fedc849928fd2605f22fcadfa9e9c5d1e55051..711ee60bad26694a29ff245f13d0401ce5f926b8 100644
--- a/modules/net/dap_chain_node_cli_cmd.c
+++ b/modules/net/dap_chain_node_cli_cmd.c
@@ -2270,11 +2270,7 @@ char    l_buf[1024];
             }
             // create wallet backup
             dap_chain_wallet_internal_t* l_file_name = DAP_CHAIN_WALLET_INTERNAL(l_wallet);
-            time_t l_rawtime;  // add timestamp to filename
-            char l_timestamp[16];
-            time(&l_rawtime);
-            strftime(l_timestamp,16,"%G%m%d%H%M%S", localtime (&l_rawtime));
-            snprintf(l_file_name->file_name, sizeof(l_file_name->file_name)  - 1, "%s/%s_%s%s", c_wallets_path, l_wallet_name, l_timestamp,".backup");
+            snprintf(l_file_name->file_name, sizeof(l_file_name->file_name)  - 1, "%s/%s_%012lu%s", c_wallets_path, l_wallet_name, time(NULL),".backup");
             if ( dap_chain_wallet_save(l_wallet, NULL) ) {
                 dap_cli_server_cmd_set_reply_text(a_str_reply, "Can't create backup wallet file because of internal error");
                 return  -1;
diff --git a/modules/wallet/dap_chain_wallet.c b/modules/wallet/dap_chain_wallet.c
index 451ca8334b569eeb228de91349c352f601f05ebe..c9d6313e017a2c73256953f845bbe1c1bb7e095b 100644
--- a/modules/wallet/dap_chain_wallet.c
+++ b/modules/wallet/dap_chain_wallet.c
@@ -601,11 +601,14 @@ if ( a_pass )
         return  log_it(L_ERROR, "Error create key context"), -EINVAL;
 
 #ifdef DAP_OS_WINDOWS
-    if ((l_fh = CreateFile(l_wallet_internal->file_name, GENERIC_WRITE, /*FILE_SHARE_READ | FILE_SHARE_WRITE */ 0, NULL, CREATE_NEW,
-                          /*FILE_FLAG_RANDOM_ACCESS | FILE_FLAG_OVERLAPPED | FILE_FLAG_NO_BUFFERING*/ 0, NULL)) == INVALID_HANDLE_VALUE) {
+    l_fh = CreateFile(l_wallet_internal->file_name, GENERIC_WRITE, /*FILE_SHARE_READ | FILE_SHARE_WRITE */ 0, NULL, CREATE_ALWAYS,
+                          /*FILE_FLAG_RANDOM_ACCESS | FILE_FLAG_OVERLAPPED | FILE_FLAG_NO_BUFFERING*/ 0, NULL);
+    if (l_fh != INVALID_HANDLE_VALUE) {
+        SetEndOfFile(l_fh);
+    } else {
         l_err = GetLastError();
 #else
-    if ( 0 > (l_fh = open(l_wallet_internal->file_name , O_CREAT | O_WRONLY, s_fileprot)) ) {
+    if ( 0 > (l_fh = open(l_wallet_internal->file_name , O_CREAT | O_WRONLY | O_TRUNC, s_fileprot)) ) {
         l_err = errno;
 #endif
         return log_it(L_ERROR, "Cant open file %s for writing, errno=%"DAP_FORMAT_ERRNUM,