Steam now allows transferring games between PCs and Steam Deck too

In the latest Client Beta available for Desktop Steam and Steam Deck, Valve put in a new feature to help you transferring games.

If enabled in your Steam Downloads settings, you can transfer games and update files from one PC to another, or from PC to Steam Deck. Useful in many different situations like having limited bandwidth, slow internet speeds, LAN parties and you get the idea. Here's a video to highlight the feature as well as various other bits of Steam Deck / Linux news:

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The full patch notes for the Steam Deck Beta:

General

• Fixed some issues where focus was lost after exiting a game
• Reduced flashing in background when scrolling through games on home screen

Local Network Game Transfers

• Added new feature that allows Steam users to copy existing Steam game installation and update files from one PC to another over a local area network, without having to download and install from a Steam content server on the internet. This reduces internet traffic and can speed up installs or updates.
• This feature is currently only PC -> PC or PC -> Steam Deck, and both sender and receiver must be opted into Steam Beta.
• Steam users have control over who files can be sent to: self only, friends only, or everyone. The default setting is self only.
• More info about this new feature can be found here.

Steam Input

• Added a loading throbber when waiting on Steam Cloud to update
• Improved the latency of querying the workshop in the Configuration Browser and fix issues with configurations popping-in or opening the wrong tab because results weren't fully received
• Added a loading throbber that shows while the Configuration Browser workshop query is running

Desktop Mode: Steam

• Added UI that temporarily takes over the "What's New" section of the Library when pre-purchased games are available to pre-load or install and play
• Added UI at startup for account selection
• Added a "sign out" option to the main menu that removes credentials for the signed in account from the machine
• Fixed a crash when the OS is notifying Steam that it should shutdown
• Improved performance of games when using Steam Workshop APIs
• Refreshed the profile games page with a new style and improved performance

Desktop Mode: Big Picture

• Fixed issue where the old BPM on-screen keyboard would appear at the same time as the new BPM virtual keyboard
• Fixed issue where user could not re-enter a context submenu after backing out of it.

Just for Desktop Steam, they also finally started getting the New Big Picture mode working better with NVIDIA GPUs, which has been pretty terrible in terms of performance. To be honest though, I can't tell any difference and if anything, it actually feels even worse than before.

These are also noted just for Desktop Steam Beta:

• Fixed issue where incoming chat messages would not be delivered properly while in-game.
• Added support for the Sony DualSense Edge controller including support for remapping of the rear buttons.
• Fixed an issue with Steam preventing PS4 controllers from being read over DirectInput when Steam Input was disabled. Note: this was already hotfixed into the non-Beta Steam client.