• 备份与迁移：magpie backup 把 magpie 里的一切打包成一个文件——供应商（连同 Key，或加 --no-keys 不带 Key）、为它们选的图标、设置、Profile 和每个 agent 选的模型；文件用口令在本机加密（AES-256-GCM，PBKDF2-SHA256 派生密钥），没有口令读不出任何内容。
• 在另一台机器上 magpie restore <文件> 即可还原：同 id 的供应商被替换，其余新增；不带 Key 的保留那台机器上已有的 Key；agent 的模型只设置那台机器装了的 agent（--no-agents 则不动 agent）。订阅账号不在备份里，需要在每台机器上各自登录。（#28，设置页里的入口和 WebDAV 同步随后提供）

---

• Backup and move: magpie backup packs everything set up in magpie into one file — the providers (with their keys, or none with --no-keys), the pictures picked for them, the settings, the profiles and every agent's model — encrypted on your machine with a passphrase (AES-256-GCM, key from PBKDF2-SHA256); nothing in it reads without the passphrase.
• On the other machine, magpie restore <file> puts it in: providers with the same id are replaced and the rest added; one that came without a key keeps the key already there; agent models are set only for the agents installed there (--no-agents leaves agents alone). Subscriptions are not in it: sign in to them on each machine. (#28; a Settings entry and WebDAV sync come next)