Check rsync destination capacity before copying

dist/urbm-2026.06.15.r017-x86_64-1.txz.sha256

@@ -1 +0,0 @@
-c4a3955c26ca3e380ae25c93d9d3e5706c65f4457ec6d1418cc1ed72b485cb9b  urbm-2026.06.15.r017-x86_64-1.txz

dist/urbm-2026.06.15.r018-x86_64-1.txz.sha256

@@ -0,0 +1 @@
+56f07ac0a18bf9067c8cb38ef6e5cbf69d52a2313e37f32f87b619268a47d6e8  urbm-2026.06.15.r018-x86_64-1.txz

dist/urbm.plg

@@ -2,13 +2,18 @@
 <!DOCTYPE PLUGIN [
 <!ENTITY name "urbm">
 <!ENTITY author "Michael Roll">
-<!ENTITY version "2026.06.15.r017">
+<!ENTITY version "2026.06.15.r018">
 <!ENTITY pluginURL "https://git.casaderoll.de/michael/URBM/raw/branch/main/dist/urbm.plg">
 <!ENTITY packageURL "https://git.casaderoll.de/michael/URBM/raw/branch/main/dist/urbm-&version;-x86_64-1.txz">
-<!ENTITY packageSHA256 "c4a3955c26ca3e380ae25c93d9d3e5706c65f4457ec6d1418cc1ed72b485cb9b">
+<!ENTITY packageSHA256 "56f07ac0a18bf9067c8cb38ef6e5cbf69d52a2313e37f32f87b619268a47d6e8">
 ]>
 <PLUGIN name="&name;" author="&author;" version="&version;" pluginURL="&pluginURL;" min="7.0.0" support="https://git.casaderoll.de/michael/URBM/issues" icon="urbm.png">
   <CHANGES>
+### 2026.06.15.r018
+- Run a write-free Rsync preflight to estimate the actual transfer size before copying.
+- Abort Rsync jobs when the estimated transfer exceeds the free destination capacity.
+- Add an explicitly confirmed override for advanced replacement scenarios where existing destination files will release enough space.
+
 ### 2026.06.15.r017
 - Add scheduled Rsync copy jobs with separate source and destination folder browsers.
 - Add explicit controls for overwrite behavior, destination deletion, permissions, ownership, timestamps, links, ACLs, extended attributes, checksums, and dry runs.